Following four release candidates, the QEMU project has announced the arrival of version 1.0 of its open source system emulator. QEMU can be used as a stand-alone desktop virtualisation product or be used to emulate guest hardware, such as an ARM-based board on a standard x86 PC.

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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump